JPH09195129A - Prevention of deforming of formed roving bobbin in roving frame and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deforming after restarting and enable the start of stopping motion Just after the output of stopping instruction regardless of a stopping position of a pressor. SOLUTION: The timing of switching between lifting drive and lowering drive of a bobbin rail vertical driving system is constituted so as to be changeable according to the instruction from a controlling means. The position of a bobbin rail is determined by a position detecting means. If the difference between an overrun length Li-1 at the last inversion and an overrun length L1 at this inversion is larger than a criterion α, the position, where an inversion instruction of the same side is output, is adjusted at and after the next inversion. By this adjustment, inversion positions of the bobbin rail at and after the next inversion come this side from the predetermined position by a specified length. The length of the adjustment to be used is the difference of overrun (Li-1 -Li ). The criterion α to be used is the value k.(ULi-1 -ULi ) obtained by multiplying the difference between the position ULi-l , where an inversion instruction was output at the last inversion, and the position ULi , where an inversion instruction has been output at this inversion by a coefficient k.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for preventing a collapse of a molded roving wound in a roving machine.

[0002]

2. Description of the Related Art Generally, in a roving machine, a roving yarn fed from a front roller at a constant speed is twisted on the roving yarn due to a difference in rotational speed between a flyer rotating at a constant speed and a bobbin rotating at a higher speed. Wind it on a bobbin while hanging it. The bobbin is supported by the bobbin rail and is moved up and down together with the bobbin rail, and the moving distance of the bobbin rail is shortened each time the direction of the bobbin rail raising and lowering movement changes, so that both ends of the roving bobbin have a conical shape. Is taken up.

Generally, in a roving machine, when a roving break occurs during a winding operation, the machine base is temporarily stopped based on a detection signal from a roving break detecting device. Also, the machine base is temporarily stopped when the roving is wound around the front roller of the draft device, at the end of work, or in an emergency. When the machine base is temporarily stopped due to roving break, it is necessary to stop the machine base promptly in order to prevent the roving end from being entangled with the spun roving of another weight and causing a new roving break. There is. When performing a temporary stop during the machine base operation, the winding of the roving yarn is not immediately stopped at the same time as the stop command, but the deceleration operation is performed and the roving yarn is stopped while winding the roving yarn even during deceleration.

If the stop and the restart are performed near the shoulder portion of the roving bobbin, so-called shoulder collapse is likely to occur due to the winding after the restart. If the shoulder collapse occurs, it will hinder the subsequent winding and the roving delivery in the subsequent process. In order to prevent the shoulder collapse, a device has been proposed in which the presser is prohibited from stopping at a position corresponding to a range of a predetermined width in the shoulder portion of the roving bobbin (for example, JP-A-49-31929). Japanese Patent Laid-Open No. 4-281020). In these devices, when the presser is in the stop operation start prohibition region near the shoulder portion, after the stop command is output, the presser starts the stop operation after passing through the region.

Further, in Japanese Unexamined Patent Publication No. 7-150424, immediately after a stop command is output, a stop operation is started to stop the machine base, and the position of the presser at the time of stop causes the bobbin rail of the restarted bobbin rail to be restarted. A method of changing the inversion position to prevent shoulder collapse has been proposed. In this shoulder collapse prevention method, when the stop position of the presser is in a preset predetermined range near the shoulder portion of the roving bob at the time of a temporary stop during operation of the roving frame, it corresponds to the stop position of the presser after restart of the operation. The operation is performed with the inversion position of the bobbin rail on the shoulder side corrected from the next inversion position after passing through the predetermined range so as to be a predetermined amount before the normal inversion position in the moving direction of the bobbin rail.

[0006]

If the temporary stop during the machine operation is caused by a roving break or a non-urgent cause, the stop operation is started from a stop command so that the presser does not stop near the shoulder. There is no problem even if you extend the time. However, in the case of an emergency stop or other emergency stop, it is necessary to stop as soon as possible after outputting the stop command. Therefore, even in a roving machine equipped with the devices disclosed in JP-A-49-31929 and JP-A-4-281020, the shoulder collapse prevention device is provided at the time of an emergency stop or a stop by a stop switch operated by an operator. The operation of is disabled. Therefore, in the case of an emergency stop, the stop position of the presser may be in the vicinity of the shoulder, and shoulder collapse may occur after the restart.

Further, in the latter half of winding when the winding diameter of the roving yarn increases, the time required for the presser to pass through the stop operation start prohibition region becomes long, and the time from the occurrence of roving yarn breakage to the machine stand stop becomes long. Then, in the weight that has broken the roving thread that was the cause of the stop, so-called "flower bloom" in which the roving thread that is sent out without being wound up accumulates in the flyer top part is likely to occur, and it takes time to process the thread splicing process. Takes extra time. As a result, the suspension of the machine stand is prolonged and the operation rate of the machine stand is reduced. Further, the roving winding of the weight becomes a so-called delayed ball having a section where the normal number of roving layers does not exist. When a delayed ball occurs, the weight may be unable to be spun depending on the spinning conditions.

As the spinning speed becomes faster, the stop operation start prohibition region needs to be set wider, and the above problem tends to become more and more remarkable due to the recent increase in speed. On the other hand, in the shoulder collapse prevention method disclosed in Japanese Patent Application Laid-Open No. 7-150424, the stop operation is started immediately when the stop command is output, so the time required from the occurrence of roving break to the machine stand is short. Therefore, the above problem is solved. However, in the method disclosed in Japanese Unexamined Patent Publication No. 7-150424, data regarding a predetermined range in which the position of the presser when the machine base is temporarily stopped is used as a criterion for determining whether shoulder collapse is likely to occur after the machine base is restarted. Must be experimentally obtained in advance. The spinning conditions include spinning roving weight, fiber type (difference between carded cotton, combed cotton, synthetic fiber, etc.), and rotational speed of the flyer, and there is a problem that it takes time to store this database.

The present invention has been made in view of the above problems, and an object thereof is to prevent shoulder collapse after restarting regardless of the stop position of the presser, and to stop immediately after a stop command is output. It is an object of the present invention to provide a method and an apparatus for preventing shoulder collapse of a molded roving wound in a roving machine that can start the roving.

[0010]

In order to achieve the above-mentioned object, in the invention according to claim 1, the switching timing of the ascending / descending drive of the bobbin rail ascending / descending drive system can be arbitrarily changed by a command from the control means. In the roving machine having a position detecting means for detecting the position of the bobbin rail, the bobbin rail from the time of the reverse command output to the time of the reverse at least the first reverse after the machine stop signal is output. If the value obtained by subtracting the amount of movement from the amount of movement of the bobbin rail from the time the reverse command was output to the time it was reversed at the previous reverse of the same side is greater than the judgment reference value, the next reverse command output timing on the same side is set. Advance the bobbin rail by a predetermined amount so that the inversion position of the bobbin rail from the next time onward will be a predetermined amount in front of the bobbin rail moving direction before the operation. .

According to the second aspect of the present invention, the position detection for detecting the position of the bobbin rail is configured so that the switching timing of the ascending / descending drive of the bobbin rail ascending / descending drive system can be arbitrarily changed by a command from the control means. In the roving machine equipped with the means, the inversion position data at the time of inversion of the bobbin rail is obtained, and when the value obtained by subtracting the inversion position data of this time from the inversion position data of the previous time is larger than the predetermined reference value, the same in the next and subsequent times. The side reversal command output timing is advanced by a predetermined amount, and the inversion position of the bobbin rail on the same side from the next time onward is operated by a predetermined amount before the planned position in the bobbin rail moving direction. I chose

According to the third aspect of the invention, in the roving machine capable of arbitrarily changing the switching timing of the ascending / descending drive of the bobbin rail ascending / descending drive system by a command from the control means, position detection for detecting the position of the bobbin rail. Means, first storage means for storing reversal position data of the bobbin rail every time the bobbin rail is switched up and down, second storage means for storing position data of the bobbin rail each time a reversal command is output, and both the storage means. Calculating means for calculating the movement amount of the bobbin rail from the time when the reversing command is output to the time when the bobbin rail is reversed based on the position data stored in the means, and at least the first means after the machine stop signal is output. First judging means for judging whether or not a value obtained by subtracting the movement amount at the time of reversal from the movement amount at the time of reversal on the same side last time is larger than a judgment reference value. When the judgment result of the first judging means is larger than the judgment reference value, the control for controlling the up / down switching of the bobbin rail up / down drive system so that the inversion command output timing on the same side from the next time onward will be advanced by a predetermined amount. And means.

According to a fourth aspect of the invention, in the invention of the third aspect, the arithmetic means is omitted and the first
In place of the determination means of, the value obtained by subtracting at least the inversion position data of the bobbin rail at the time of the first inversion after the machine stop signal is output from the inversion position data at the time of the previous inversion on the same side is a predetermined value. A second judging means for judging whether or not the value is larger than the reference value is provided, and when the judgment result of the second judging means is larger than a predetermined reference value, the inversion command output timing on the same side after the next time is a predetermined amount. A control means for controlling the up / down switching of the bobbin rail up / down drive system is provided so as to speed up.

In the first aspect of the invention, the position of the bobbin rail is detected by the position detecting means. At least the amount of movement of the bobbin rail from the time the reversal command is output to the time of reversal during the first reversal after the machine stop signal is output,
The value subtracted from the movement amount of the bobbin rail from the time the reverse command is output to the time the reverse is performed at the time of the previous reverse of the same side is compared with the determination reference value. When the difference is larger than the judgment reference value, the inversion command output timing of the same side from the next time onward is advanced by a predetermined amount, and the inversion position of the bobbin rail from the next time onward is increased by a predetermined amount from the planned position. The up / down drive switching timing of the bobbin rail up-and-down drive system is changed so as to come before the moving direction of the.

According to the second aspect of the invention, the reversal position data at the time of reversing the bobbin rail is obtained. Then, when the value obtained by subtracting the present reversal position data from the last reversal position data is larger than the predetermined reference value, the next and subsequent reversal command output timings on the same side are changed by a predetermined amount earlier. As a result, the operation is performed such that the inversion position of the bobbin rail on the same side from the next time onward is a predetermined amount before the planned position in the moving direction of the bobbin rail.

According to the third aspect of the invention, the position of the bobbin rail is detected by the position detecting means, and the inversion position data of the bobbin rail is stored in the first storage means every time the bobbin rail is switched up and down. The second storage means stores the bobbin rail position data each time the reverse command is output. Based on the position data stored in both storage means, the arithmetic means calculates the amount of movement of the bobbin rail from the time the reversal command is output to the time when the bobbin rail is reversed. Then, a value obtained by subtracting the movement amount at the time of the first reversal after at least the machine stop signal is output by the first determination means from the movement amount at the time of the previous reversal of the same side is greater than the determination reference value. It is determined whether or not it is larger. When the determination result of the first determination means is larger than the determination reference value, the control means controls the up / down switching of the bobbin rail up / down drive system so that the next and subsequent inversion command output timings on the same side are advanced by a predetermined amount. It

According to the fourth aspect of the invention, the reversal position data of the bobbin rail at the time of the first reversal after the at least the machine stop signal is output by the second determination means is set to the data at the time of the reversal on the same side last time. It is determined whether the value subtracted from the inversion position data is larger than a predetermined reference value. When the determination result of the second determination means is larger than the predetermined reference value, the control means controls the up / down switching of the bobbin rail up / down drive system so that the next and subsequent inversion command output timings on the same side are advanced by a predetermined amount. To be done.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. The drive system of the roving machine is basically the one previously proposed by the applicant of the present invention (Japanese Patent Laid-Open No. Hei 5 (1999) -53977).
No. 214619). As shown in FIG. 2, the front roller 1 is rotated via a gear train (none of which is shown) arranged between one end of the rotary shaft 1a and a driving shaft which is rotationally driven by the main motor M. It is designed to be driven. The driven gear 3 is fitted and fixed on the upper portion of the flyer 2 so as to be integrally rotatable.
Engages with a drive gear 5 fitted to a rotary shaft 4 through which the rotation of the driving shaft is transmitted via a belt transmission mechanism. On the other hand, a driven gear 7a is fixed to a bobbin wheel 7 mounted on the bobbin rail 6. A rotating shaft 9 to which a driving gear 8 meshing with a driven gear 7a is fitted and fixed has a rotating force of a driving shaft and a rotating force of a winding motor 11 which is speed-changed via an inverter 10b. It is designed to be synthesized and transmitted by the mechanism 12. The winding motor 11, the differential gear mechanism 12, and the like constitute a winding speed transmission that reduces the bobbin rotation speed in response to an increase in the roving winding layer.

A lifter rack 13 is fixed to the bobbin rail 6. Gear 1 meshing with lifter rack 13
The rotation of the drive shaft 17, which is driven by the lifting motor 16 that is variable-speed driven via the inverter 10c, is transmitted to the rotary shaft 15 to which 4 is fitted via the switching mechanism 18 and the gear train. The switching mechanism 18 includes an intermediate shaft 19, and a pair of gear trains 20 and 21 provided between the intermediate shaft 19 and the drive shaft 17.
And electromagnetic clutches 22 and 23 for transmitting the rotation of the gear trains 20 and 21 to the intermediate shaft 19. And
The direction of rotation of the rotary shaft 15, that is, the direction of vertical movement of the bobbin rail 6 is changed by exciting and demagnetizing the electromagnetic clutches 22 and 23. A rotary encoder 24 is connected to one end of the rotary shaft 15 as position detecting means for detecting the position of the bobbin rail 6 in the vertical direction. The rotary encoder 24 also serves as a sensor that detects the ascending / descending speed of the bobbin rail 6. The lifter rack 13, the gear 14, the rotary shaft 15, the lifting motor 16, the drive shaft 17, and the switching mechanism 18 constitute a bobbin rail lifting drive system.

A known roving breakage detection sensor PH is provided near the upper part of the flyer rail (not shown). The roving machine is also equipped with an emergency stop switch ES and a stop switch S (shown in FIG. 3). The stop switch S is operated by the operator when the roving is wound around the front roller or when the work is finished.

Next, the electrical configuration for controlling the drive of the drive system will be described with reference to FIG. The microcomputer 26 constituting the control device 25 includes a CPU (central processing unit) 27 as an arithmetic means, a first judging means and a control means.
And a read-only memory (R
Program memory 28 as a storage means including OM)
And The microcomputer 26 serves as a first and a second storage means composed of a readable and rewritable memory (RAM) for temporarily storing the input data input by the input device 29 as the input means and the arithmetic processing result in the CPU 27. A work memory 30 is provided.
The input device 29 is integrally incorporated as a keyboard into the control device 25, and includes spun roving weight, fiber type, flyer rotation speed, twist number, bobbin diameter, roving winding shoulder angle, bobbin diameter at the start of winding, etc. The spinning conditions are input to the work memory 30 by the input device 29.

The output signals of the rotary encoder 24, the roving breakage detection sensor PH, and the stop switches ES and S are input to the CPU 27 via the input interface 31. The rotary encoder 24 has a rotary shaft 15
Different pulse signals are output in accordance with the forward rotation and the reverse rotation of the bobbin rail 6, and the rise and fall of the bobbin rail 6 can be confirmed from the pulse signal.
The CPU 27 operates based on the program data stored in the program memory 28. The CPU 27 is adapted to calculate the ascending / descending speed and position of the bobbin rail 6 based on the output signal from the rotary encoder 24. C
The PU 27 stores position data indicating the position of the bobbin rail 6,
It is stored in the work memory 30 each time a reversal command is output and at each reversal, and the overrun amount at the time of reversal of the bobbin rail 6 is calculated based on the position data stored in the work memory 30. The overrun amount means the amount of movement of the bobbin rail 6 from when the reversal command is output to when the reversal is actually performed.

The CPU 27 includes an output interface 32, motor drive circuits 33a, 33b and 33c and an inverter 1.
The main motor M, the winding motor 11, and the lifting motor 16 are drive-controlled via 0a, 10b, and 10c. Further, the electromagnetic clutches 22 and 23 are controlled in their excitation / demagnetization based on a signal from the CPU 27 via an electromagnetic clutch excitation / demagnetization circuit 34, and the bobbin rail 6 is moved up and down (reversed) by switching the electromagnetic clutches 22 and 23 to the excitation / demagnetization. Is to be done. The bobbin rail 6 is moved upward when the first electromagnetic clutch 22 is excited,
The electromagnetic clutch 23 is moved downward when it is excited. Both electromagnetic clutches 22 and 23 are never excited at the same time.

The CPU 27 outputs an inversion command signal every time the bobbin rail 6 reaches a predetermined position. When the value obtained by subtracting the overrun amount at each reversal from the overrun amount at the previous reversal is equal to or larger than the determination reference value, the CPU 27 advances the reversal command output timing on the same side from the next time onward by a predetermined amount. ing.

Next, the operation of the apparatus configured as described above will be described. Prior to the operation of the machine stand, the spinning conditions such as the spun roving weight, the fiber type, the number of flyer revolutions, the number of twists, and the shoulder angle of the roving are input by the input device 29.

After that, the operation of the machine base is started, and the front roller 1 and the flyer 2 are rotationally driven by the main motor M, respectively. An output signal from the rotary encoder 24 is input to the CPU 27 as the machine base is driven. At the same time when the machine base is started, the winding motor 11 and the lifting motor 16 are also driven, and the rotational force of the main motor M input to the differential gear mechanism 12 and the rotational force of the winding motor 11 are differential gears. The rotating shaft 9 is driven by the combined rotating force of the mechanism 12 and the bobbin wheel 7 is driven to rotate. As a result, the roving R spun from the front roller 1 is twisted by the flyer 2 and wound on the bobbin B rotating at a higher speed than the flyer 2 in layers. Further, the bobbin rail 6 is moved up and down together with the lifter rack 13 via the switching mechanism 18, the rotary shaft 15 and the like by driving the lifting motor 16.

The winding speed and the ascending / descending speed of the bobbin rail 6 are gradually reduced as the roving layer increases by changing the rotation speeds of the winding motor 11 and the ascending / descending motor 16.
The CPU 27 always calculates the position of the bobbin rail 6 based on the output signal from the rotary encoder 24. As shown in FIG. 4, the position of the bobbin rail 6 has a position coordinate set so as to increase in the upward direction of the bobbin rail 6 with the lower end of the roving winding position of the bobbin B as the origin (0). Expressed as a value.

The first lower reversal command output position DL ₁ and the first upper reversal command output position UL ₁ are determined by the lift length LL and the margin Lm input by the input device 29.
Further, the i-th lower reversal command output position DL _i and the upper reversal command output position UL _i are set according to the following equations unless there is an abnormality such as an intermediate stop.

DL _i = DL ₁ + (i−1) Δφ cotθ (1) UL _i = UL ₁ − (i−1) Δφ cotθ (2) where Δφ is a constant determined by spinning conditions and θ is It is the shoulder angle of the roving bobbin.

If the actual reversal position of the bobbin rail 6 at the i-th reversal is x _i , the overrun amount L _i is L _i = x _i −UL _i or L _i = DL _i −x _i . expressed. When the overrun amount fluctuates by a predetermined amount or more, the CPU 27 changes the reversal command output position so that the actual reversal position is always in front of the previous reversal position on the same side in the moving direction of the bobbin rail 6. Control the rail lifting drive system.

The procedure for setting the reversal command position by the CPU 27 will be described with reference to the flowchart shown in FIG. In step S1, the CPU 27 sets the upper reversal command output position UL ₁ for the _{first time} by setting i = 1 in the equation (2), and proceeds to step S2 to determine whether the bobbin rail 6 is the up / down switching position, that is, the upper reversal command output position.
Whether or not UL ₁ is reached is determined based on the output signal of the rotary encoder 24. When the bobbin rail 6 reaches the upper reversal command output position UL ₁ , the CPU 27 proceeds to step S3 and outputs the up / down switching command, that is, the reversal command signal. The inversion command signal is an excitation / demagnetization switching command signal for the electromagnetic clutches 22 and 23. Further, the CPU 27 stores the position data UL _i (= UL ₁ ) at the time of outputting the inversion command signal in the working memory 30.

Next, the CPU 27 calculates the overrun amount in step S4. That is, the CPU 27 stores the actual reverse position of the bobbin rail 6 in the work memory 30 as reverse position data x _i (= x ₁ ) based on the output signal of the rotary encoder 24. Then, the overrun amount L _i (= L ₁ ) at the time of the inversion is calculated from the value and the position data by L _i = x _i −UL _i . Next, the CPU 27 proceeds to step S5, and calculates the difference Δ between the overrun amount L _i-1 at the time of the previous inversion on the same side and the current overrun amount L _i.
Calculate L _i = (L _i-1 −L _i ). In step S4 and step S5, the CPU 27 functions as a calculation unit. The 0th overrun amount L ₀ is zero.

Next, the CPU 27 proceeds to step S6 and determines whether or not the difference ΔL _{i in the} overrun amount is larger than a predetermined determination reference value α. In step S6, the CPU 27 functions as a first determination unit. The criterion value α is α = k
Represented by ΔUL _i , k is a number from 0 to less than 1, and ΔUL _i =
(UL _i-1 −UL _i ). If the difference ΔL _{i in the} overrun amount is larger than the determination reference value α, step S
7, the next upper reversal command output position UL _{i + 1} is calculated by the following equation (3).

UL _{i + 1} = UL _i −ΔUL _{i + 1} −ΔL _i = UL _i − (UL _i −UL _{i + 1} ) − (L _i−1 −L _i ) = UL _{i + 1} − (L _{i −1} −L _i ) (3) That is, the next upper reversal command output position UL _{i + 1} is a predetermined amount from the preset upper reversal command output position UL _{i + 1} (previous time and current time in this embodiment). Difference in overrun amount (L
_i-1− L _i )) is set to be the front side in the moving direction of the bobbin rail 6. Then, the process proceeds to step S8, and after i = i + 1 in the equation (2), the process returns to step S2, and similarly, the upper reversal command position at each reversal after the second time is set.

In step S6, the difference ΔL _{i in the} overrun amount
Is less than or equal to the determination reference value α, the CPU 27 determines in step S
9, the next upper reversal command output position UL _{i + 1} is calculated according to the following equation (4).

[0036] _{UL i + 1 = UL i -ΔUL} i + 1 = UL i - (UL i -UL i + 1) = UL i + 1 ... (4) i.e., the next upper reversing command output position UL _{i + 1} Is set to be equal to the preset upper reversal command output position UL _{i + 1} . In steps S7 and S9, the CPU 27 functions as setting means.

The lower reversal command output positions DL _i and DL _{i + 1} are also set in the same manner as described above. However, the CPU 27 calculates DL _i by using the equation (1) instead of the equation (2) in steps S1 and S8. When calculating DL _{i + 1} in steps S7 and S9, the following equation (5) is used instead of the equation (3), and the following equation (6) is used instead of the equation (4). To calculate DL _{i + 1} .

DL _{i + 1} = DL _{i + 1} + (L _i-1 −L _i ) ... (5) DL _{i + 1} = DL _{i + 1} (6) The roving yarn is fed to the control device 25 during machine stand operation. Disconnection sensor PH,
When the ON signal (machine stop signal) is input from the stop switch S or the emergency stop switch ES, the CPU 27 starts the machine stop operation based on the signal, and the machine is stopped. The machine stop operation is independent of the position of the bobbin rail 6,
An ON signal from the roving breakage detection sensor PH or the like is sent to the CPU.
It starts immediately when 27 is input. Therefore, the bobbin rail 6 may stop at a position where the presser 2a is near the shoulder portion of the roving spool P.

Next, when the bobbin rail 6 is moved up and down under the condition that the reversal command output position is sequentially set as described above, even if the presser 2a stops at or near the shoulder of the roving spool P, The reason why the shoulder collapse does not occur will be described by taking the reversal on the upper side as an example.

The value of the overrun amount L _i at the time of reversal during the constant speed operation may be the same (L _i-1 = L _i = L _{i + 1} ) at the time of the reversal and before and after the reversal. Further, the difference ΔUL _i = between the (i-1) th upper reversal command output position UL _i-1 and the i-th upper reversal command output position UL _i
(UL _i-1 −UL _i ) can be basically considered to be constant regardless of i.

It is assumed that the machine base is stopped halfway before the n-th inversion, and a stop occurs at or near the shoulder. In this case, since the first reversal after the restart, that is, the n-th reversal in total, is reversal at a low speed during acceleration (or deceleration), the overrun amount L _n is the reversal during constant speed operation. The value is smaller than the overrun amount L _n-1 and the next overrun amount L _{n + 1} .

In this case, the inversion command output position after the restart is simply expressed by the formula (2) even after the (n + 1) th time and after the stop.
When the operation is continued according to the above setting, as shown in FIG. 5A, the (n + 1) th reversal position becomes a position beyond the nth reversal position, or as shown in FIG. 6A. In addition, the (n + 1) th inversion position becomes very close to the nth inversion position, and there is a risk that the shoulder may collapse later.

However, in this embodiment, as described above, after the n-th inversion is completed, the (n-1) -th overrun amount L _n-1 and the n-th overrun amount L _{n are obtained.}
And the difference ΔL _n with the reference value α are compared, and the next reversal command output position UL _{n + 1} is set based on the comparison result. Then, if the difference ΔL _n is larger than the determination reference value α, as shown in FIGS. 5B and 6B, (n +
1) The inversion command output position after the first time should be a predetermined amount X (= L _n-1 −L _n ) from the planned inversion command output position UL _{n + 1} before the bobbin rail 6 in the moving direction. Is set. Therefore, the inversion command output position after the nth time is
The reversal positions before the (n-1) th time are aligned on the same straight line, and the actual reversal position x of the bobbin rail 6 is
_i are also aligned on the same straight line. Therefore, shoulder collapse does not occur.

As described above, the criterion value α is α = k · ΔUL
It is represented by _i , and k is a coefficient set as a number of 0 or more and less than 1. ΔUL _i (= UL _i-1 −UL _i ) can be basically considered to be constant regardless of i. In the case of k = 0, if the current overrun amount L _n is smaller than the previous overrun amount L _n−1 , the next reverse command output position UL _{n + 1} is always corrected before the planned position. . Since the predetermined amount X which is the correction amount is the difference ΔL _n between the overrun amounts, the correction amount also becomes small if the difference ΔL _n between the overrun amounts is small. Therefore, even if the correction is applied when the current overrun amount L _n is slightly smaller than the previous overrun amount L _n-1, the amount becomes small and there is no problem.

When k = 1, the difference in overrun amount ΔL _i
This means that correction is not performed when = L _i-1 −L _i is less than or equal to the difference ΔUL _i between the previous upper reversal command output position UL _i-1 and the current upper reversal command output position UL _i . (N-1)
The difference ΔL _n between the overrun amount at the nth time and the overrun amount at the nth time is equal to ΔUL _n means that the difference is (n + 1).
This means that if the upper-side inversion command output position UL _{n + 1} for the second time is not corrected, the actual inversion position x _n for the nth time becomes the same as the actual inversion position x _{n + 1} for the (n + 1) th time.

This is because x _n = L _n + UL _n ,
Since ΔL _n = ΔUL _n = UL _n-1 −UL _n , x _n = {L
_n-1 − (UL _n-1 −UL _n )} + UL _n = L _n-1 −UL _n-1 +2
UL _n . On the other hand, x _{n + 1} = L _{n + 1} + UL _{n + 1}
Since L _{n + 1} = UL _n −ΔUL _n and L _{n + 1} = L _n−1 , x _{n + 1} = L _n−1 + {UL _n − (UL _n−1 −UL _n )} And x _{n + 1} = L _n-1 −UL _n-1 +2 UL _n . Therefore x _n
= X _{n + 1} .

Therefore, in order to prevent shoulder collapse, it is necessary to correct the (n + 1) th upper reversal command output position UL _{n + 1} when the difference ΔL _{n from the} overrun amount is larger than ΔUL _n. . In this embodiment, when the difference ΔL _{i from the} overrun amount is larger than ΔUL _i , the predetermined amount X (= ΔL _i
Since the correction of _i ) is performed, shoulder collapse is prevented.

The value of the coefficient k of the judgment reference value α = k · ΔUL _i may be a number of 0 or more and less than 1 as described above, but 0.2
≦ k ≦ 0.5 is preferable. If the coefficient k is 0 or close to 0, the correction is applied if the current overrun amount is smaller than the previous overrun amount, so that the control operation is frequently performed, but if 0.2 ≦ k, it is not necessary. There is no correction. Further, if the coefficient k is set to a value close to 1, the actual reversal position of the bobbin rail 6 may be close to the reversal position of this time. Therefore, k ≦ 0.5 is preferable.

5 (b) and 6 (b), the correction amount and the like are exaggerated for convenience, and the overrun amount L
_i and the difference DerutaUL _i like the upper reversing command output position is actually both values of about 1mm in only a small amount of level difference below 1mm shoulder generated by the correction.

This embodiment has the following effects. (B) If the value obtained by subtracting the overrun amount at the first reversal after the machine stop signal is output from the overrun amount at the previous reversal on the same side is larger than the judgment reference value α, The inversion command output timing on the same side is advanced by a predetermined amount so that the inversion position of the bobbin rail 6 from the next time onward is a predetermined amount before the planned position in the moving direction of the bobbin rail 6. As a result, even if the presser 2a stops at or near the shoulder, the occurrence of shoulder collapse at the time of winding after restarting can be prevented.

As a result, the bobbin rail 6 can be stopped in the shortest time regardless of the position of the bobbin rail 6 when the machine stop signal is output. Therefore, unlike the case where the stop operation start prohibited area is provided, the occurrence of delayed balls is significantly reduced. Further, the so-called "flower bloom" in which the roving R that is not wound around the bobbin B is accumulated in the flyer top portion by the roving cutting weight that is the cause of the stop when the roving is stopped is prevented. As a result, the yarn splicing process is completed in a short time, and the operating efficiency of the roving machine is improved.

(B) When the stop switch S is pressed to stop the machine base, the operator can press the stop switch S at a desired position without worrying about the position of the presser 2a. Therefore, when rolling up of the roller part occurs in which the roving winds around the roller part, the machine base can be stopped immediately, and damage to the parts is less likely to occur.

(C) In order to set the judgment reference value α used for judging whether or not the reverse command output timing should be corrected, it is necessary to perform trial spinning in advance corresponding to various spinning conditions. Absent. (D) Since the judgment reference value α is set to k · ΔUL _i (k is a coefficient of 0 or more and less than 1 and ΔUL _i is the difference between the previous and present overrun amounts), the value of the coefficient k corresponds to the spinning conditions. By changing the, the reversal command output position for preventing shoulder collapse can be corrected more appropriately.

(E) Since the predetermined amount X, which is the correction amount for correcting the reverse command output position, is the difference ΔL _i between the previous and current overrun amounts, the correction amount is set corresponding to the overrun amount. Therefore, it is possible to set an appropriate value without increasing the correction amount more than necessary.

(F) Since it is determined at each reversal time whether or not the reversal command output timing is corrected, even if the overrun amount is drastically reduced during operation due to some cause other than the machine stop, the next time Subsequent inversion timing is corrected, and the effect of preventing shoulder collapse is enhanced.

The present invention is not limited to the above embodiment, but may be embodied as follows, for example. (1) In the above embodiment, the position data of the reversal command output position and the position data of the actual reversal position (reversal position data) at each reversal are calculated, and the value is used to determine whether correction is necessary. The difference ΔL _{i in the} overrun amount, which is the value for the above, and the predetermined amount X (= ΔL _i ) for the correction are calculated. Instead, the difference Δ of the position data of the actual inversion position
Let x _i be a value for determining whether correction is necessary, and a predetermined amount X for correction is the difference ΔUL between Δx _i and the reverse command output position ΔUL.
_It may be obtained from _i and.

The actual inversion position of the i-th time is x _i = L _i +
Since it is represented as UL _i , the difference between the (i−1) -th and i-th actual inversion positions x _i−1 , x _i is transformed as follows.

X _i-1 −x _i = (L _i-1 + UL _i-1 ) − (L
_i + UL _i ) = (L _i-1 −L _i ) + (UL _i-1 −UL _i ) = Δ
L _i + ΔUL _i ∴ΔL _i = (x _{i −1} −x _i ) −ΔUL _i Therefore, ΔL _i and α are calculated in step S6 of the above embodiment.
Instead of comparing (= k · ΔUL _i ), (x _i-1 −x _i ) −
It is also possible to compare ΔUL _i and k · ΔUL _i , that is, to determine whether or not the following equation holds. In this case, the CPU 27
And (k + 1) ΔUL _i becomes a predetermined reference value.

(X _i-1 −x _i )> (k + 1) ΔUL _i Then, X = (x _i-1 −x) as a predetermined amount X for correction.
_i ) -use ΔUL _i . In this case, the necessity of correction can be determined from the difference ΔUL _i between the actual reversal position data and the reversal command output position without calculating the overrun amount L _i at each reversal. The predetermined amount X can also be set.
As a result, the amount of calculation of the CPU 27 can be smaller than that in the above-described embodiment in which the amount of overrun is calculated. (2) Instead of a predetermined amount X of the previous and the difference [Delta] L _i of when reversing the overrun amount of time for correction, may be a constant value irrespective of the difference [Delta] L _i of overrun. When a constant value is set, for example, the first overrun amount L ₁
Set to. In this case, since the correction amount is constant, the control becomes simple. In addition, the difference ΔL _{i of the} overrun amount is set to 2, 3
It may be divided into stages and set to a predetermined amount according to each stage, for example, the maximum value of the overrun amount of each stage.

(3) Instead of making a judgment as to whether or not it is necessary to correct the reversal command output position on the same side every time the bobbin rail 6 is reversed, the first command after the machine stop command is output Only when reversing, it may be determined whether the next reversal command output position needs to be corrected. For example, compare the judgment reference value with the value obtained by subtracting the overrun amount at the first reversal after the restart after restarting after the machine stop signal is output and the overrun amount at the previous reversal on the same side. If the difference in the overrun amount is larger than the determination reference value, the inversion command output position on the same side from the next time onward is corrected. The correction amount may be set as in the embodiment or as in (2). Further, as in (1), it may be determined whether or not the correction is necessary based on the actual reversal position data. In this case, it becomes unnecessary to judge whether or not the correction is necessary and the necessary calculation in the steady operation in which the shoulder collapse does not occur, and the control becomes easy.

(4) In the above-mentioned embodiment, the storage area for the position data and the reversal position data at the time of outputting the reversal command is provided in the working memory 30 corresponding to the roving layer up to the full pipe, and the position data for each layer is provided. Instead of storing all of the above, a storage area for position data of two layers is provided. Then, the position data may be sequentially updated. Since both the position data are necessary for determining whether or not the next reversal command output position needs to be corrected and for setting the reversal command output position, after the reversal command output position is set, The previous position data used is no longer necessary, and you can update the data. In this case, the capacity of the work memory 30 can be small.

(5) Instead of storing the reversal command output position data in the working memory 30 each time each reversal command is output, a value corresponding to the spinning conditions (shoulder angle θ of roving spool, lift length LL) Is stored in the program memory 28 for each layer as a function of the number of layers. Then, the value may be used before the correction is applied, and after the correction is applied, the inversion command output position may be calculated from the value and the correction amount. In this case, program memory 2
8 functions as a second storage means.

(6) As a means for switching the raising / lowering direction of the bobbin rail 6 at an arbitrary time, a variable speed motor capable of forward / reverse rotation is used as the raising / lowering motor 16 instead of providing the switching mechanism 18. It is also possible to adopt a configuration in which 15 is driven to rotate in the forward and reverse directions. Further, as in the device started in Japanese Patent Laid-Open No. 7-150424, a known molding device is used, and the engaging state between the levering bracket and the pair of pigeon catches forming the molding device is set at any time. A device provided with switchable means may be used. An air cylinder driven via an electromagnetic control valve (not shown) operated by a command signal from a control device (CPU) is arranged above the pigeon catch. The piston rod of the air cylinder is arranged in a working position where the pigeon catch is rotated to a position where it cannot engage with the leversing bracket in the protruding state, and in a standby position where it cannot engage with the pigeon catch in the retracted state. There is.

(7) Even if the cone drum is used to change the rotation speed of the bobbin wheel 7 and the ascending / descending speed of the bobbin rail 6, as in the device disclosed in Japanese Patent Laid-Open No. 2-242925. Good.

(8) As a position detecting means of the bobbin rail 6, a so-called magnet scale in which a large number of permanent magnets of which N poles and S poles are alternately arranged is arranged in the vicinity of the elevation range of the bobbin rail 6. At the same time, the detection unit may be fixed to the bobbin rail 6 so as to be movable integrally, and the detection signal of the detection unit may be input to the control device 25 to detect the position of the bobbin rail 6. In this case, the lifter rack 13
An error due to the influence of backlash that occurs when position detection is performed via the gear 14 that meshes with is eliminated.

Inventions other than those described in the claims that can be grasped from the above-described embodiments and modifications will be described below along with their effects. (1) The bobbin rail inversion position is detected each time the bobbin rail is moved up and down, and the difference between the previous overrun amount on the same side and the overrun amount at the time of inversion is calculated,
The difference is compared with the judgment reference value, and if the difference is equal to or smaller than the judgment reference value, the up / down switching timing on the same side from the next time onward is advanced by a predetermined amount and the reversal position of the bobbin rail on the next time or later is scheduled. A method for preventing shoulder collapse of a formed roving winding in a roving machine, which is operated such that a predetermined amount of position is in front of the bobbin rail in the moving direction. In this case, even if the overrun amount is significantly reduced during the operation of the machine for some reason, the reversal timing from the next time onward is corrected and the shoulder collapse prevention effect is enhanced.

(2) In the invention described in claim 1,
Only at the first inversion after the machine stop signal is output, it is determined whether or not the inversion command output timing needs to be corrected. In this case, it becomes unnecessary to judge whether or not the correction is necessary and the necessary calculation in the steady operation in which the shoulder collapse does not occur, and the control becomes easy.

(3) In the invention described in claim 1, claim 3 and (1), the determination reference value is set to a predetermined difference between the positions of the bobbin rails at the time of outputting the previous reverse command and at the time of outputting the current reverse command. The value is multiplied by a coefficient (a number of 0 or more and less than 1). In this case, by changing the value of the coefficient k in accordance with the spinning condition, it is possible to more appropriately correct the reversal command output position for preventing shoulder collapse.

(4) In the inventions of claim 1, claim 3, (1) and (2), a predetermined amount for correcting the reverse command output timing is set as a predetermined amount at the time of the previous reverse of the same side and at the time of the reverse. Use the difference in overrun amount. In this case, it is possible to set an appropriate value corresponding to the overrun amount without increasing the correction amount more than necessary.

[0070]

As described in detail above, claims 1 to 4 are provided.
According to the invention described in (1), it is possible to prevent the shoulder collapse after the restart regardless of the stop position of the presser, and the stop operation can be started immediately when the stop command is output. As a result, the yarn splicing processing time is shortened, the occurrence of delayed balls is reduced, and the operating rate of the machine base is improved. In addition, it is not necessary to store a database of judgment criteria as to whether or not the reverse instruction output timing (position) needs to be corrected.

In the inventions according to claims 2 and 4,
The amount of calculation processing for determining whether or not the reversal command output timing (position) needs to be corrected is reduced.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a procedure for setting a reverse command output position.

FIG. 2 is a schematic diagram of a drive system of a roving frame.

FIG. 3 is a block diagram showing an electrical configuration of a control device.

FIG. 4 is a schematic diagram illustrating a reversal position of a bobbin rail.

FIG. 5A is a schematic diagram showing an inverted state when a shoulder collapse occurs, and FIG. 5B is a schematic diagram showing an inverted state when correction is performed.

FIG. 6A is a schematic diagram showing an inverted state when there is a risk of shoulder collapse, and FIG. 6B is a schematic diagram showing an inverted state when correction is performed.

[Explanation of symbols]

6 ... Bobbin rail, 13 ... Lifter rack constituting bobbin rail lifting means, 16 ... Similarly lifting motor, 18
... Similarly, switching mechanism, 24 ... Rotary encoder as position detecting means, 25 ... Control device as control means, 27
... CPU as calculation means, first judgment means, second judgment means and control means, 30 ... Working memory as first and second storage means.

Claims (4)

[Claims] 1. A rough spinning machine comprising a position detecting means for detecting the position of the bobbin rail, the change timing of the ascending / descending drive of the bobbin rail lifting drive system being arbitrarily changeable by a command from the control means. , At least the amount of movement of the bobbin rail from the time the reversal command is output to the time the reversal occurs during the first reversal after the machine stop signal is output, If the value subtracted from the movement amount of the bobbin rail is larger than the judgment reference value, the inversion command output timing of the same side from the next time onward is advanced by a predetermined amount and the inversion position of the bobbin rail from the next time onward will be greater than the planned position. A method for preventing a collapse of a formed roving spool in a roving machine, which is operated such that a predetermined amount is located in front of a moving direction of a bobbin rail. 2. A rough spinning machine having a position detecting means for detecting the position of the bobbin rail, the change timing of the ascending / descending drive of the bobbin rail raising / lowering drive system being arbitrarily changeable by a command from the control means. , The inversion position data at the time of inversion of the bobbin rail is obtained, and when the value obtained by subtracting the inversion position data of this time from the previous inversion position data is larger than the predetermined reference value, the inversion command output timing of the same side from the next time onward is determined. Move the bobbin rail on the same side from the expected position to the front in the moving direction of the bobbin rail by a predetermined amount before the next time, and move the bobbin rail on the same side forward by a predetermined amount. Collapse prevention method. 3. In a roving machine capable of arbitrarily changing the switching timing for raising and lowering of a bobbin rail raising / lowering drive system by a command from a control means, position detecting means for detecting the position of the bobbin rail and raising / lowering of the bobbin rail. First storage means for storing inversion position data of the bobbin rail for each switching, second storage means for storing position data of the bobbin rail at each output of the inversion command, and position data stored in both storage means Based on the calculation means for calculating the movement amount of the bobbin rail from the time the reversal command is output to the time of reversing the bobbin rail, at least the movement amount at the time of the first reversal after the machine stop signal is output. A first judging means for judging whether or not a value subtracted from the movement amount at the time of reversing the same side last time is larger than a judgment reference value; and the first judging means. If the judgment result of is larger than the judgment reference value, the roughing machine equipped with a control means for controlling the up / down switching of the bobbin rail up / down drive system so that the inversion command output timing on the same side from the next time onward will be advanced by a predetermined amount. Prevention device for molded roving wound in. 4. A position detecting means for detecting the position of the bobbin rail, and a bobbin rail elevating / lowering in a roving machine capable of arbitrarily changing the switching timing of the ascending / descending drive of the bobbin rail ascending / descending drive by a command from the control means. First storage means for storing reversal position data of the bobbin rail for each switching, second storage means for storing position data of the bobbin rail for each reversal command output, and after at least a machine stop signal is output. Second determining means for determining whether or not a value obtained by subtracting the inversion position data of the bobbin rail at the time of the first inversion from the inversion position data at the time of the inversion on the same side last time is larger than a predetermined reference value, When the result of the determination by the second determining means is larger than a predetermined reference value, the bobbin rail is lifted and lowered so that the inversion command output timing on the same side from the next time onward will be advanced by a predetermined amount. Molding crude yarn shoulder collapse prevention device in Rover and control means for controlling the switching lifting system.